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Yang F, Zhang H, Cai S, Imtiaz K, Li M, Wang M, Liu Y, Xue F, Zhang L, Gu F. Green Fluorescent Protein Tagged Polycistronic Reporter System Reveals Functional Editing Characteristics of CRISPR-Cas. CRISPR J 2022; 5:254-263. [PMID: 35085009 DOI: 10.1089/crispr.2021.0056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The green fluorescent protein (GFP)-based reporter system has been widely harnessed as a quick quantitative activity assessment method for characterizing CRISPR-Cas via flow cytometry. However, due to the small size (738 nt) of the GFP coding sequence, the targeting sites for certain CRISPR-Cas are greatly restricted. To address this, here we developed a GFP tagged polycistronic reporter system to determine the activity of CRISPR-Cas in human cells. Specifically, the system contains the herpes simplex virus thymidine kinase (TK) gene, bacterial neomycin phosphotransferase (Neo) gene, and green fluorescent protein (GFP), named TNG gene, with a coding sequence of 2,577 nt. To investigate its performance, we generated a human cell line harboring the TNG expression cassette at the AAVS1 locus, and then we tested it with different Cas orthologs (SaCas9, St1Cas9, and AsCas12a). Our results demonstrated that using the TNG reporter system greatly expands the targeting site selection (3- to 13-fold) with CRISPR-Cas genome editing. The study therefore reports an additional method for the characterization of CRISPR-Cas technology.
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Affiliation(s)
- Fayu Yang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Hao Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Shuo Cai
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Kiran Imtiaz
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Mingchun Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Mi Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Yingchun Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Feiqun Xue
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Lifang Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
| | - Feng Gu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P.R. China; and Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China.,Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural Affairs, Shanghai, P.R. China
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